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by notherhack 223 days ago
For NAT (Network Address Translation) or any other packet header modifications, you need to recalculate checksums manually

Why doesn’t checksum offload in the NIC take care of that?
1 comments
jcalvinowens 222 days ago
And I'm confused how they have to correct the TCP checksum but not the IPv4 header checksum...
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shivanshvij 222 days ago
Oh no we absolutely have to also correct the IPv4 header checksum!
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